wisdom



(No Model.) 2 Sheets-Sheet 1.

S. J5WISDOM.

JACK. No. 292,725. Patented J-an. 29, 1884.

WITNESSES: T INVENTOIR= ATTORNEYS.

(No Model.) l2 Sheets-Sheet 2'.

s. J. WISDOM.

' JACK. I N0. 292,725. I Patented Jan. 29, 1884.

WITN SSES: I INVENTOR:

Bi %0Im:mrs

UNITED STATES PATENT OFFICE.

SAMUEL J. WISDOM, OF MONTGOMERY, ALABAMA.

JACK.

SPECIFICATION forming part of LettersPatent No. 292,725, dated January 29, 1884.

To all whom it may concern-.-

Be it known that I, SAMUEL J. WIsDQM, Montgomery, in the county of Montgomery and State of Alabama, have invented a new and Improved Jack, of which the following is a full, clear, and exact description.

The Object of my invention is to obtain a compact and powerful jack or purchase for removing piston-rods from the cross-heads of steam-engines and for other purposes. I Reference is to be had to the accompanying drawings, forming part of this specification, in

which similar letters of reference indicate corresponding parts in all the figures.

Figure lis a perspective View of my jack. Fig. 2 is a view of part of a cross-head with the jack in position as in operation. Fig. 3

-in which is fitted a screw-bolt, D, having a head by which it can be turned, and a pointed, inclined, or rounded end, d. At right angles to this bolt is fitted amovable pin or plug, E, which is inclined or rounded upon its inner end, where it comes in contact with the end of the bolt D, so that when the bolt D is screwed down the plug E is forced out. Theside of the block A opposite to the plug is hollowed or forked, so that it may rest firmly against the cross-head pin 12, while the plug E bears against the end of the piston-rod C, as shown in Fig. 3. Several plugs may be used in one block, all operated by one screw in the same manner as the plug E. In some .casesaas, for example; where the distance between the end of the piston-rod and the cross-head pin will permitI use also another plug, e, similar to E, the plug 6 having a forked head to bear against the cross-head pin, and the inner end inclined Application filed October 3, 1883. No model.)

or rounded, so as to be acted upon by the bolt D in the same manner as the plug E, as shown in Fig. 4..

Theoperation of my jack is as follows: The

bolt D is screwed'back, so that the plug E can be pushed in. The blockAis placed, as shown in Figs. 2 and 3, between the ends of the piston-rod O and thecrosshead pin 12. .A piece of copper or other soft metal, 0, is insertedbecan be used. The bolt D is screwed back, and

the two plugsE and e pushed in, and the whole adjusted so as to bring the fork of the plug 6 against the copper c and cross-head pin 12, and the plug E against the piston-rod 0, when, upon screwing in the bolt D, both plugs E and e are simultaneously driven out, forcing the piston-rod twice as far out as can be done with the single plug E, as described. This jack can also be applied to a lathe for straightening rods or shafting, and will be found very useful for many other purposes.

Having thus described my invehtiomwhat I claim as new, and desire to secure by Letters Patent, is y, 1. The combination, with a cone -pointed screw, a nut in which it works, and means to tween the fork of the block and the finished surface of the pin b, to protect the latter from take the wedge-strain, substantially as dewhereby the whole device may be arranged between the cross-head pin and piston-rod of a steam-engine, to operate as described.

SAMUEL J. WISDOM. Y

Witnesses:

K. J. DUGGAN, H. E. STRINGFELLOW. 

